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Finding the Fourth Proportional to 157,728.52, 217,668.65 and 86,111.56

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Solution

The fourth proportional to 157,728.52, 217,668.65 and 86,111.56 is: 118,835.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    157,728.52 : 217,668.65 = 86,111.56 : x
  2. Step 2: Convert to fraction form
    157,728.52/217,668.65 = 86,111.56/x
  3. Step 3: Cross multiply
    157,728.52x = 217,668.65 × 86,111.56
  4. Step 4: Simplify right side
    157,728.52x = 18,743,787,014.59
  5. Step 5: Solve for x
    x = 18,743,787,014.59/157,728.52
  6. Step 6: Final answer
    x = 118,835.75

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.